New submission from Sumanth Ratna <sumanthra...@gmail.com>:
The following all return None on macOS Big Sur, but return a valid path (str)
on macOS Catalina:
python3.6 -c "from ctypes import util; print(util.find_library('objc'))"
python3.7 -c "from ctypes import util; print(util.find_library('objc'))"
python3.8 -c "from ctypes import util; print(util.find_library('objc'))"
The solution I'm thinking of is using platform.mac_ver() in
ctypes.util.find_library to see if the macOS version is either 10.16 or 11.0;
if so, use an alternative method to locate the path of the library
somehow—else, use the current functionality. I'm hoping that looking in
/System/Library/Frameworks/ is enough.
>From the macOS Big Sur release notes
>(https://developer.apple.com/documentation/macos-release-notes/macos-big-sur-11-beta-release-notes):
> New in macOS Big Sur 11 beta, the system ships with a built-in dynamic linker
> cache of all system-provided libraries. As part of this change, copies of
> dynamic libraries are no longer present on the filesystem. Code that attempts
> to check for dynamic library presence by looking for a file at a path or
> enumerating a directory will fail. Instead, check for library presence by
> attempting to `dlopen()` the path, which will correctly check for the library
> in the cache. (62986286)
Related links:
- https://bugs.python.org/issue41116 (this is a build issue, but is related I
think)
-
https://stackoverflow.com/questions/62587131/macos-big-sur-python-ctypes-find-library-does-not-find-libraries-ssl-corefou
-
https://www.reddit.com/r/MacOSBeta/comments/hfknpa/is_corefoundation_missing_for_everyone_on_big_sur/
- https://github.com/vispy/vispy/issues/1885
- https://github.com/napari/napari/issues/1393
- https://github.com/espressif/esptool/issues/540
This is my first issue in Python; sorry in advance if I've made a mistake
anywhere.
----------
components: ctypes
messages: 372728
nosy: Sumanth Ratna
priority: normal
severity: normal
status: open
title: find_library on macOS Big Sur
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8
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<https://bugs.python.org/issue41179>
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